#include <map>
#include <string>
#include <iostream>
using namespace std;
int main()
{
    map<int,string> mapStudent;
    mapStudent[1] =  "student_one"; 
    mapStudent[1] =  "student_two"; 
    mapStudent[2] =  "student_three";
    map<int, string>::iterator iter;
    for(iter = mapStudent.begin(); iter != mapStudent.end(); iter++){
        cout<<iter->first<<" "<<iter->second<<endl;
    }
    return 0;
}
